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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '05cc8e8dd39e89d0b1558f42ade987a7fab6d84bd58e5561fa52016efbeb52b3' 
  AND token = '370hdSzBzdoON5Q9Iv0DlehiBHtxjWVhGN5zas8SbKQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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