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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb459caa3a36341d77d52d81616ed1cdcdd9a26c57c12b0ced57283aed10b7f1' 
  AND token = 'dX+TCvGdo4s74VgV25oD1F5/0IkNMWm3O3Cu1PYJNDU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00057

JSON explain

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