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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32dd1b78e65ee1cecbed36c2e7813a9fdca6e2d7ae6b59f7904f96c8fcab2983' 
  AND token = '0x/M9y4fqcnFVYu7QhWqnv1z3nw77mpFwuqL64XFS3k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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