SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d316bfbc5d5d7533a353fa33a1bb5f97fafda387829749b89df16a327a14652' 
  AND token = 'Y+T/TxwG+6jcmYwUJuIc9zy5G37rMUB6dhSqupB9SB0=' 
  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"
    }
  }
}