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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '185d893e09bc206249dc59e8ecac4a7b589825ee7aa3f1fe04339f53b3009ee6' 
  AND token = 'sVZT1hGd6//Egg4GEA5hcr55I92p+yzXRiuzaSPTcIY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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