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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1bafed34d17bad46842623d527dc388ecdd9f7a4bf913f1d9170d1226c41e009' 
  AND token = 'PPZPXCoN6hlh94GPV0trM1j68cxFnUMVDLl9snWtFrc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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