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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '20917fa12d2962d9478132d3f1257cb656b66354bb633d1ebb28c7f9e967fd2a' 
  AND token = 'Eh0PqOaiqGajn9K5clqLEF08aXnWbzj2ooi6KsTIpqM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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