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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6fbb0da0b76cff6b7a45bc4e7c750bcb5a56e24ab118b9f10d83130fe7513706' 
  AND token = 'f4Mt/Uc3xi+lM5Y+wlXNJO4lexS1qTEh64igEmjFbK0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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