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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '27a3c76532acb47a2f0b587ad64c680ab1334940ee48bb15463a7b331aae06d8' 
  AND token = 'CChfAwuLSbC62s+ISMgitFPpS8Htxr/y6TTr4vZ3JGs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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