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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90ef8bf42e34dfdb1f5bc80da068ef5d9648c2a71f7fafb86ea526ac1fced3ae' 
  AND token = '55xrLsI9SFiqsmHimijrZpuVWW4QaouPAxPNlB6ky/Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}