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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2e15bf1fc6018167123705fdeab66dd9dc89baad723cf76e295d11d6f6a8b52d' 
  AND token = 'LHvVz/kgDnDNH1izMXuGLJV5Ccl0fT5k1vkO/remBMI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00066

JSON explain

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