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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94ff5a6e7973842b6fd5053d4cf287ad1c4a1b0e281e9a18664396e79a561fb0' 
  AND token = 'vSSw7b9lmxjhmum78I0ANnNeMfQDP8UREBQC96raT3s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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