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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6475905d0c130adffe306cacc53fa9341611cac49677b4d4e8b9171d61462534' 
  AND token = 'WmA+Elv4E3z0YW5WMsSBloM3gTdfJm9pgJlbFJkrrWU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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