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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '50f67fc5e324966f53f5678734fed3c2c21952214b25364ac25c7ddc101f5d74' 
  AND token = '38ciaOGKnWN2hVatip8gV+hE60b7I7FsP3KauYMjPEs=' 
  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"
    }
  }
}