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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1eecb4996ef405ed028e94f42455ddc6842c646b96cda15bb6c1d91d3702ec19' 
  AND token = 'S4exnq7eIy+wArbJ+z1LxSoTF3/dT8ooBcgiAMlp0Jw=' 
  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"
    }
  }
}