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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '00893aba3affd4a7f1051f8399e78018372e9e2712844ebd1130f12482b763c8' 
  AND token = 'Z/aSei/4vRI2qUZNhPUSToEActDkv9iRqt/D7/U7c3U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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