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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c0d0bb6b522f738ef0c64efd7300c47e9b405a523cbe53d5b43d8f114458d299' 
  AND token = 'qMgBmgbsysoTsqM/AmpBEF6g88dPTji3wbymBT+hCRg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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