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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd686d9f03ed8cb30ee20425bb7002b0e343bfb742648fd58241deb0ae731e374' 
  AND token = 'KMmQXe86JZ6C6xiW3EyOhv2q6YvGerzphXRCzyjvWsc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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