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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b0f59f4cfc305c4896fe4e151c7ad62357caa24bed89b56d3842018d14a21721' 
  AND token = 'h1q+fCf6tsKFCOm60LekB3ab9WK+M08BM8p2mLKsX9w=' 
  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"
    }
  }
}