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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7980d55d946ac36d45ff3af905f35e0c273b7a4493016f3d93f3d46e3c6ad771' 
  AND token = 'nlxFU/B9QMUJ5AX71pB48XaM/yBDQK8Hk8StHZNEW64=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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