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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f0c93ffbc33c1d2edaba6089774008275afb7c8f48180eb8de4097d4b95142d' 
  AND token = 'NVll+ciVEDKE38cOLiNv8NQuq1JQFTg20NYqu+HXwK8=' 
  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"
    }
  }
}