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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '15cd2f79f2dc513ae92a4f7ca17efeb27d5e7dae5f03ad6d2585e07fae864bbe' 
  AND token = 'T99MSg135eYRxF9JqsEFEiPv/ce1zaUNwnvTy5Nz9W8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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