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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '05e17208ac7c481cd230c49bf8c409b146b34d9c4184dbe6d9e054d9c2e783f7' 
  AND token = '4Sod9En2291aF1KRSdqvXO7atdCcbrZkwauZdUExDcM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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