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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fad3ff78b318253442e35eda742ef2fbe3c90c6cd95c712f7c85816d93539bcd' 
  AND token = 'RIQhEKci5K6Z3UlSmvnTt4kSjtG2aE5DmPe+T5qCn1U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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