SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6708a14d21a83749b3d5968d2c08b9cea43aac13547970ad1322c64533247f8' 
  AND token = 'ziom/FU9VCOXwrJezEhx2UKbdyVGlDGZ14wptnzgWII=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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