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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eed066a7ced61ac8420a715e16df2a342a7a04b338a3f489b013a0c01e47709e' 
  AND token = '4eOaWg9Qj3k5cDcesS9OfIXYKcK5UKoEu6ECOQGW/jA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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