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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb26aea405bf6d4d21335b4c1a0caffaac01136778fbab752c93c63a7e731898' 
  AND token = 'LOoKIqw77GQjGQbcjZwn4I/nYwL/WbKn7seM5uqvS8U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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