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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7be9d3932e3c5068477467c40a09bb5e7e3743c3095987eb0059af360aa7c360' 
  AND token = 'B+v7MKWvBZ8HH8szPup1NPJN7QL4xi166Fbu/u4WqwM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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