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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d98f4d6ea3cf447a379bd447cbc05b730def0117825f036e82280296d6a0908' 
  AND token = 'cgQ5uWV42l43Fyok8R/jAv7G8Gs5EkT3SxVvnCedvRs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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