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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8e40fc80d24289838c4732a9aeacd639e1f1d837b9357d6212987cb8c5b3d564' 
  AND token = 'ShX/KggrVUPf6RTOXrwl1GXrUdzV7E7etj7z5ct9CQM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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