SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6fe814d6726a387d4be89b7288daf5a1160ae40169dc37548226aa8714163955' 
  AND token = 'b0qprXwOZKBHzWyvzVGb4CjnDDdxvaKuRgS8beM2unE=' 
  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"
    }
  }
}