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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a2a4d37b1ad3c67552e73c62bcccc145267d4ee3f9964ed725a2c239b96db94' 
  AND token = '97+DcI/3/E2kkbrEaJF9jzDgufqeS7CabCNA+Wt1uQI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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