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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b99fb00dabc3f8e2202b8b31e4a6b7f3f3bd97a829d4fb56cad902b65dbb1ac' 
  AND token = '4LDhWhdLb9FbKkwz9Q8V82A/HxFVISP1Yq3wSZLYaTQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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