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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91d4b258a8852e5a5c4ffdc77380f6a6f4dbeb32e21ff9ba19c961262e8b5002' 
  AND token = 'pNoQ7ZbtRmb0JRmf8Ozh1XryvoPvD2tIOki7qL7vwr8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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