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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1438e8b4faa5608f0aaed44756411fddf76cd0e9609375663a4f3786c92353ce' 
  AND token = 'u4odTLSbj4AxYPV4Bhlz8I4mrBtB/FFgbZoyQtZE/Q8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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