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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e760b5c02308d9ed7d32d6328ffd48b929a7da0644a0b196d31088295e9a1f9e' 
  AND token = 'pC8YUOxNeoU8P8TZbO6GqcODb2m9LzOyddScy+ML3Uo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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