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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b909cc99f68c029692df9052d03704a9deacc4273b3b22d68c3f498d6df8f0f' 
  AND token = 'qSaLPPHn1PGos60o+Ebeg1nwBT44wVM1SL3YOi8YF48=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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