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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4e9584e65ab00f1e0b31958dde3ca31bb179a7cb510a616e85f2291c0a5b28cd' 
  AND token = 's93ykPll1iXaFQxqyY1Ag+RSCfh2S0E2gUP/Si2en/o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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