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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aed4cab781a88506a6bee2dd8dfff03d301b74bb6c10398b6888ea9667cccd6b' 
  AND token = 'Uzd9cQu7dG1U6GS7ccbSeGAcUrxIqj/yqVTyd5kYkNA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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