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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f28ffc4ea669fdd164aede337c921e4797e09b2c12b10a57607a2200a19d0e38' 
  AND token = '8Ln50a5w1D42uxLdd6DFEMGW6Wloge9eBChnvS0L4Ak=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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