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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd6f2b2ae520ebaaa53de380eaded0d1adfb2ea1782478988d40da36cede6e42' 
  AND token = 'vx5to2jKncq22ckxYO9E+t/kk4iQNTnog87nYDg92AE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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