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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc8780591ed00779f745ad81c7b083cb4c1511088c37ba5206fa237749ad168a' 
  AND token = '+89Z5JqgmwrhHcEXg3e/EOwjYoR3TJfjQ7NJFh1XESE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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