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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a605c3018a1715e7eaecf2238752b7e2f833b212be0aec5998098bf62093b4f8' 
  AND token = 'ROJrhYiY9KkQziyJPtri+n8/M54eVPb3K1/ZLe+D+qM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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