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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '659f6c05608d9beeca5b0406323e29dba41309adefd5c8fd7eba3c9e4e310ec6' 
  AND token = 'YnZDNSoRnI9kL0667VRnBaYYW1Kmy4vKzHkGI62jIwM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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