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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc03af555a4d082ad5b0890189047c67786ed00bae511619891dcb98561c0415' 
  AND token = 'HCoSKIF8ZH55cLmR2Iju1E6dRWUiJHmTGt36R8SJ8GQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00012

JSON explain

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