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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '37d124bbe31f94c8e38cda32c5543ddda8a6d6770ec68e6bd4ed7fd107a860e8' 
  AND token = 'ha9lsKs71sYbjMXk0W05LwoBaGw8Hn+hA9tahxi9B3A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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