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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '372dcc2019028ddc13ba7a3991ae5318fb0ebc9801ee1e3f29dfb68fa20f839d' 
  AND token = 'oToeT9q9ZUtmNlcW6jUGmpLRxuLqo51k4I26vdWhPxw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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