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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d2e5a8968413c3e147fd36d34d1635b984b4af5cbcfb00b7f3371480d2cd823' 
  AND token = 'Z/wjiVhdkkpjlXbb0kWmlaIwmBktJpqlB3RlQpITi0s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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