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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08d559ce9178302d1502db8c3f1706713e59fff113e7560262b3b45790fa8360' 
  AND token = 'X+6DHvLCAdN07Ln3klzezQSSGZtFx5iqaOm5tB8Pcmo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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