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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c849be1f6feae2b49c4016341a91ac4e6300eab30f6d5534e728c7f38dcc5416' 
  AND token = 'wv3iK+RV0YlWu5MS6xqMyLtJQIGU33d8VLOP2rrA2KQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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