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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd9b6854b081d6a33c2e4949abd346bd489f477ee42bdb474ab46fe58e3da9d4' 
  AND token = 'OhAWkDbg3lio3lOfqAgfZwKJumhHSixmyS5Y2IZEYRM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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