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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '45007aa3b7e698aeb841862716beedcc74fee62d5678a3efcbf8bcc995a7f955' 
  AND token = '9bM6kb3fGgbSVjMy2zo8aZmxSAx40TUuFJBi3MIYgt4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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