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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13158a260002c13d5d7a949339865bf2ce48cbe789fd2645276955425a367f0d' 
  AND token = 'ib1zlP+N2ulSGhlenk7lRLnYdaf1NpViCpJ+bY2O6RQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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