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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ce6f4ae98e1c12d3f571c2fec472fe330965133fb19d79b1e1328fda6d304de' 
  AND token = '2xIkcu7ZCX4LjwGj1ybohl76aqBn6HaBeWtrSgg9HJ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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