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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '09171083f9560d3df91ce0c8ed417c0ca8009633ee3ea40e163b1762053484bb' 
  AND token = '8wGB2BRLEYbYyiFldt3k2MH102k3rkZ4paWa9dZnvWk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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