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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aed31510e33d59b8dcb67a5dd79bfb1a28407752c8d5bb71d72d991bd7fa2e41' 
  AND token = 'GRVrX4bYXeF9F+YGgqXwA4eder3qMBb+LFxG1bxRVGc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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