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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83f36020efbe77e8b0d918165b67fb619e0c7b4ceaf3c6f00d70b70c24ffbfc4' 
  AND token = '4R0fv4za1H2ly7Kqu/deKMmvDFNBJU1DC01pJVdX290=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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