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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa97dfa41ea1d1c88545a328ec7e8cef026016be7bd3e49ead1c4d4542238693' 
  AND token = 'OzpQU1CBcMG07SvZ0Iyau8qBh+VYUcrTur0xeH2W5oM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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