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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae74b605ce895ce109e5985a6767a57987cd029cb5c18f7bb693fe2e814383f0' 
  AND token = '64YUMInssX3b8Mx+9agxkgf/1hS0uWUnycdwoItLR/Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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