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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '61b343a0ad93130920bd8db97c1b6429d8634d31acc7eacb003957b1b102f665' 
  AND token = 'H64IwKOeKrbdmmG4Ue1/JvP+57HsrR1yc/uTNZadx0c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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