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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f045d173a9443541e34b12b38a18b7f1ef8f68169de1bfa9debd58d6e95a0dc' 
  AND token = 'Bd9CqAXDjHQwxDdBYy5i8MNmQargJABeAczQJfzOp6M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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