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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'de55f30352c54c395a00cfa80ed39af9a314b612a429c441bf7cdd62c9cd118f' 
  AND token = 'SNlU/NkEbUGzGSf9wBU0xYkLbPZmMf8pJ42Ske7Zn20=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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