SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '781d15147dba37be452688622fe459e38ada6caf522963c3d0530d6e614e6b4e' 
  AND token = 'XGwMpNJvt9kHDAN7eo1lCa/+i8CviSV6umlwYNwghU4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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