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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '321d0275af6eff0e01f95edb74d4afecc4c124b83d3da527a26d4b4806009000' 
  AND token = 'zjbk+vg707AUckHwvnFKV9/eLoxNoerX12RW33Vki8A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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