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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '06d659d35c41a04c41a1d7cc542e15b3e37b18cd00e460233eee2ee4c067fb87' 
  AND token = 'MH1B5kutC6Y4Yl3LMn53zv+cd4ddr1JewpbUj2C54K8=' 
  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"
    }
  }
}