SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3401e7b712672da68631616cb50d39edcc286f1d1b4955446f989cf807574533' 
  AND token = 'q10h3N/NfJYFDLqJsQ8/J+Lz1I/8u8CHZn+OFoQ/FKA=' 
  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"
    }
  }
}